PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/17-08:28:00
G10     297.0          51.5                4.0 +/-    2.76       5.0 +/-    2.76  0.140 / 0.060
G15     46.0           27.5                2.0 +/-    1.59       3.7 +/-    1.59  0.130 / 0.050
G20     56.0           43.5                4.2 +/-    1.43       5.7 +/-    1.43  0.040 / 0.060
G21     96.7           73.9                3.8 +/-    0.95       3.9 +/-    0.95  0.040 / 0.060
G24     97.7           26.5                4.3 +/-    1.46       8.1 +/-    1.46  0.060 / 0.050
G27     299.8          34.6                3.8 +/-    1.94       6.1 +/-    1.94  0.060 / 0.060
G32     210.4          33.5                5.7 +/-    2.14       9.4 +/-    2.14  0.040 / 0.040